1. Deliver what you promise. If you say your video has rock stars and it doesn't, you might get more clicks the first time, but viewers won't return. Write a a great headline to get viewers to give the video a chance, but make sure the video lives up to the hype. This also means your video should have clear concise and interesting content, and good audio and video quality.
2. Don't say it ALL. If you want viewers to return, make sure to leave something unsaid that they want to hear. The "Chris Davis Project" for Spartan Coaching is a perfect example. People want to check back week after week to see if Chris will reach his goal.
3. Be consistant. Once you have created interest and suspense, don't leave viewers hanging. Set regular release times. Have your production company create a graphics package that will unify the series. A consistent open and close is a good idea too, but be sure the open is not too long or people will click away.